KR930015283A - Spindle motor speed control circuit and its control method - Google Patents

Abstract

The present invention relates to a rotational speed control circuit of a spindle motor and a method of controlling the same. From the data, the time difference between the FG signal applied by the motor rotational speed detection unit 1 and the sampling signal applied by the sampling circuit unit 2 is determined, and the duty ratio is controlled by controlling the PWM duty conversion unit 6 according to the determination result. It generates a variable PWM duty pattern, and the PWM duty pattern drives the spindle motor at constant speed.

Description

Spindle motor speed control circuit and its control method

As this is a public information case, the full text was not included.

1 is a functional block diagram of a rotational speed control circuit of a spindle motor according to the present invention,

2 is a view for explaining the signal and output relationship of the back EMF generated by the spindle motor and the frequency generator,

3 is a waveform diagram illustrating a variable principle of a pulse midth modulation (PWM) pulse pattern for controlling a rotational speed of a spindle motor according to the present invention;

4 is a flowchart illustrating a method of controlling the rotational speed of the spindle motor according to the present invention.

Claims (8)

The motor rotational speed detection unit 1 for detecting the rotational speed of the spindle motor, the sampling circuit unit 2 for sampling each time the spindle motor rotates to generate the sampling signal, and controlling the operation of the entire circuit while the sampling signal is controlled. A controller (3) for determining a rotational speed of the motor based on the input, a first memory (4) storing rotational speed data between a control program for the rotational speed of the spindle motor and a pre-arithmically calculated sampling signal, and the control unit The second memory 5 which stores the actual rotation sampling result of the spindle motor determined under the control of (3), and the PWM duty pattern for driving the spindle motor in accordance with the rotational state of the motor determined by the controller 3 is variable. PWM duty converter 6 for generating a signal for driving the spindle motor at a constant speed, and spindle motor drive for driving the spindle motor in accordance with the output of the PWM duty converter 6. 7 that the equipped composed of the spindle motor rotation speed control circuit according to claim. The rotation speed control circuit of claim 1, wherein the PWM duty signal comprises a plurality of cycles in which the duty ratio is varied according to the instantaneous rotation speed between the magnets of the spindle motor. The PWM duty converter (6) according to claim 1 or 2, wherein the PWM duty converter (6) varies the duty width of the first level section (a) of the first cycle (Js) with respect to the speed deviation of the spindle motor. A rotation speed control circuit of a spindle motor, characterized in that the duty width of the second level section (d) of two cycles (Js) is varied. The spindle as claimed in claim 3, wherein the PWM duty converter 6 determines the variable width of the second level section d of the second cycle J _D according to a subsequent FG signal input. Rotational speed control circuit of the motor. A method of controlling the rotational speed of a spindle motor for keeping the rotational speed of the spindle motor constant, comprising the steps of: detecting the rotational speed of the spindle motor; and generating a sampling signal by sampling during the rotation of the spindle motor; Determining the actual rotation speed of the spindle motor based on the input rotation speed data, and calculating the speed error based on the result of the determination of the rotation state of the spindle motor, based on the calculated speed error. The rotational speed control circuit of the spindle motor, characterized in that the step consisting of varying the PWM duty. 6. The rotational speed control circuit of claim 5, wherein the PWM duty signal comprises a plurality of cycles in which the duty ratio is varied according to the instantaneous rotational speed between the magnets of the spindle motor. The method as claimed in claim 5 or 6, wherein the step of changing the PWM duty causes the duty width of the first level section a of the first cycle Js to be varied with respect to the speed deviation of the spindle motor. A rotation speed control method for a spindle motor, characterized in that the duty width of the second level section (d) of Js) is varied. The spindle according to claim 7, wherein the PWM duty converter (6) is configured to determine the variable width of the second level section (d) of the second cycle (J _D ) in accordance with a subsequent FG signal input. Rotational speed control method of motor. ※ Note: The disclosure is based on the initial application.